Which speakers will fill 5,000 cubic ft coherently


In porevious threads I've bemoaned the fact that my Kharma 3.2 FEs don't fill the room, 17 X 23 X 15 ft ceilings with a vertical enough soundstage, as though the speakers are literally too small. I have been advised to raise them,which I have done, , I have told to get taller, line arrays, even given names of custom speaker makers. Any specic recommendations from those that have had, and have conquered, this issue.
springbok10
My overall space is 45' x 20' x 18' (tall). My Zu Definition 2s sit at one end and fill the entire space with music with ease.
Could it be that your speakers are big enough, but the real problem is dynamic compression if they are forced to produce full range music they they can't in order to fill the room? Even many larger full-range speakers have a single midrange and high frequency driver that are placed very close to one another, with additional drivers used to fill in the bottom octaves. Maybe adding a subwoofer or two can solve the problem. It might be worth trying before changing our your mains.
Get some horns why mess arround you have a large space get a large loudspeaker to fill it. Or you will be back asking why your new loudspeakers dont fill your room.